If you mean our atmosphere, then it depends. If the population of animals does not increase dramatically and us humans "go greener", then the toxic chemicals in our atmosphere will lower and the atmosphere will stay healthy for millions of years. If we stay like we are now, polluting the atmosphere, then the air will get ruined within a few hundred years.
Air Raids could last from just afew hours to a whole night.
Depends on the area of the building you put it in or if its outside it doesnt last long.
The film is 103 minutes long .
When well-maintained it can last for ten years.
'Bout 4 minutes
coon fukkers
The Last Airbender is 103 minutes in duration .
The refrigerant (freon) in any air conditioner should last the life of the unit. If not, you have a leak.
15 yrs
The Royal Air Force has lasted since 1918 and still exists.
it generally last 2 days the most if not popped if it hits a tree its dead:(
Provided it is stored out of sunlight in an air tight container sugar will last for years.